最初的端到端测试ExacTrac动态深呼吸吸气保持呼吸工作流程使用一个呼吸保持乳房幻影
Simon K Goodall1,2, Peter L Rampant3
1School of Physics, Mathematics, and Computing, Faculty of Engineering and Mathematical Sciences, University of Western Australia, Crawley, WA, 6009, Australia. Simon.goodall@research.uwa.edu.au.
ExacTrac动态 (ETD) 与深呼吸呼吸 (DIBH) 提供精确的乳腺癌治疗定位. 优化的成像参数和Hounsfield Unit (HU) 值确保了准确的患者设置,最大限度地减少了安全有效的放射治疗的剩余错误.
科学领域:
- 医学物理 医学物理
- 辐射瘤学 辐射瘤学
- 图像指导 图像指导
背景情况:
- 深呼吸暂停 (DIBH) 对于在乳腺癌放射治疗期间将风险器官的辐射剂量降至最低至关重要.
- 准确的患者定位对于有效的DIBH治疗提供至关重要.
- ExacTrac Dynamic (ETD) 提供了一种用于图像引导和呼吸控制监控的综合解决方案.
研究的目的:
- 为了确定ExacTrac动态 (ETD) 立体X射线成像在深呼吸呼吸 (DIBH) 工作流程中的最佳成像参数.
- 建立理想的霍恩斯菲尔德单位 (HU) 值,以生成准确的患者轮以定位.
- 为了评估ETD系统的端到端 (E2E) 定位精度,用于使用定制幻影的DIBH乳腺治疗.
主要方法:
- 立体X射线成像参数 (kV,mAs) 变化以评估与模拟成像的一致性.
- 测试了不同的霍恩斯菲尔德单位 (HU) 值 (-600 HU至-200 HU),以获得最佳的患者轮生成.
- 使用乳腺DIBH幻影测量端到端 (E2E) 定位精度,将ETD与现有图像指导 (IG) 进行比较.
主要成果:
- 最佳成像参数被确定为60kV和25mAs.
- 霍恩斯菲尔德单位 (HU) 的值在-600 HU和-200 HU之间,为定位提供了足够的患者轮.
- 与ETD的剩余同心位置误差是最小的 (例如,垂直0.1 ± 0.5毫米).
- 骨质加权匹配增加了残余误差,而模拟的DIBH体积减小保持了准确性.
结论:
- 该ExacTrac动态 (ETD) 系统证明了在DIBH乳腺治疗中临床实施的适用性.
- 优化的成像参数和HU值确保了准确的患者定位,这对于DIBH放射治疗至关重要.
- 该系统的性能表明,在接受DIBH放射治疗的乳腺癌患者中,有可能提高治疗准确性和安全性.
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